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Article

Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel

1
Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia
2
Department of Petroleum Engineering, Faculty of Natural Resources, Al Zawia University, Al Zawia 16418, Libya
3
Department of Metallurgical and Environmental Engineering, Institute for Technology of Nuclear and Other Mineral Raw Materials, Bulevar Franš d’Eperea 86, 11000 Belgrade, Serbia
*
Authors to whom correspondence should be addressed.
Academic Editor: Alberto E. Monsalve
Metals 2021, 11(7), 1011; https://doi.org/10.3390/met11071011
Received: 20 May 2021 / Revised: 15 June 2021 / Accepted: 19 June 2021 / Published: 24 June 2021
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Multiphase Steels)
Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 °C were isothermally treated in the range from 350 to 600 °C and subsequently water quenched. The final microstructure of the samples held at 350 °C consisted of bainitic sheaves and had compressive yield strength, approximately from 1000 MPa, which is attributed to high dislocation density of low bainite. At 400 and 450 °C, acicular ferrite became prevalent in the microstructure. It was also formed by a displacive mechanism, but the dislocation density was lower, leading to a decrease of compressive yield strength to approximately 700 MPa. The microstructure after the heat treatment at 500 °C consisted of coarse non-polygonal ferrite grains separated by pearlite colonies, principally dislocation free grains, so that the compressive YS reached a minimum value of about 700 MPa. The microstructure of the samples heat-treated at 550 and 600 °C consisted of pearlite and both grain boundary and intragranular ferrite, alongside with some martensite. After 600 s, austenite became stable and transformed to martensite after water quenching. Therefore, the presence of martensite increased the compressive YS to approx. 800 MPa. View Full-Text
Keywords: medium carbon microalloyed steels; bainite; acicular ferrite; incomplete reaction phenomenon; multiphasic steel; retained austenite medium carbon microalloyed steels; bainite; acicular ferrite; incomplete reaction phenomenon; multiphasic steel; retained austenite
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MDPI and ACS Style

Dikić, S.; Glišić, D.; Fadel, A.; Jovanović, G.; Radović, N. Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel. Metals 2021, 11, 1011. https://doi.org/10.3390/met11071011

AMA Style

Dikić S, Glišić D, Fadel A, Jovanović G, Radović N. Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel. Metals. 2021; 11(7):1011. https://doi.org/10.3390/met11071011

Chicago/Turabian Style

Dikić, Stefan, Dragomir Glišić, Abdunnaser Fadel, Gvozden Jovanović, and Nenad Radović. 2021. "Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel" Metals 11, no. 7: 1011. https://doi.org/10.3390/met11071011

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